Publication date: 10th April 2024
The development of highly efficient and flexible technologies based on renewable energy resources are essential for the industry decarbonization. In the case of pure oxygen production, oxygen transport membranes (OTMs) appear as an alternative technology for the cryogenic distillation of air, the most common technology for oxygen production. This kind of membranes are controlled for his mix ionic and electronic conductivity (MIEC) and a difference of pO2 between both chambers. In addition, OTMs could provide oxygen from different sources (air, water, CO2, etc.), and they are more flexible to adapt to current processes, producing oxygen at 700-1000 °C. In this matter, decrease the reactor temperature could effect in the global efficiency, improving the operability of this membranes in different processes.
The first part of this study focuses on electrification on a traditional OTM material (Ba0.5Sr0.5Co0.8Fe0.2O3-d), imposing different electric currents/voltages along a capillary membrane. Thanks to the emerging Joule effect, the membrane-surface temperature, and the associated O2 permeation flux can be adjusted. Here, the OTM is electrically and locally heated and reaches 900 °C on the surface, whereas the surrounding of the membrane was maintained at 650 °C. The O2 permeation flux reached for the electrified membranes was ~3.7 mL/min·cm2, corresponding to the flux obtained with an OTM non-electrified at 900 °C. Furthermore, OTMs can be integrated in catalytic membrane reactors, providing new pathways for different processes, like oxidative dehydrogenation, partial oxidation, etc. In this study was evaluated the effect of the electrification in oxidative dehydrogenation of ethane (ODHE), taking to account that the ODHE reaction is very sensitive with the temperature. Our results indicate that OTM electrification improves the ODHE reaction by achieving higher yields to ethylene if compared to the non-electrified membrane, viz. 40% and 10%, respectively. In summary, this work highlights the benefits of membrane electrification by decreasing the operational temperature, which can be applied to several reactions for fuel and chemicals production enabling higher conversions and selectivity to targeted products.
Financial support by the Spanish Ministry of Science and (PID2022-139663OB-I00 and CEX2021-001230-S grant funded by MCIN/AEI/10.13039/501100011033) and by MCIN with funding from NextGenerationEU (PRTR-C17.I1) within the Planes Complementarios con CCAA (Area of Green Hydrogen and Energy) and it has been carried out in the CSIC Interdisciplinary Thematic Platform (PTI+) Transición Energética Sostenible+ (PTI-TRANSENER+), and the Universitat Politècnica de València (UPV) is gratefully acknowledged. Also, we acknowledge the support of the Servicio de Microscopía Elcectronica of the UPV.
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